I had the same experience running redline MTL on my zhp as you are having now with the 135i. Swapped it for D4 ATF and it’s a little better.
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I had the same experience running redline MTL on my zhp as you are having now with the 135i. Swapped it for D4 ATF and it’s a little better.
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Ambient temps were 53F this morning. Coming from a cold start straight into first and second gear with no issues. Way smoother when cold and overall a much more enjoyable experience. I feel much better knowing the right fluid is in the car.
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I've been looking at clutches since around the time I planned on buying this car. Running 150hp+ over stock was going to give some issues eventually so I wanted to get my ducks in a row before the clutch outright failed and I hadn't done any research.
I've had the clutch slip ever so slightly a few times in 4th 5th and 6th now all under 2k rpms when I go WOT. It's enough to get me thinking.
So BMW uses the same clutch on the F10 550i and the 335is. (Linked Here)
(Pulling from this post)
This sounds right for my car and I think it will easily hold power for a long while. Yes I plan to make it faster, but that will take a lot of other parts (turbos injectors etc) so I have no immediate plans for that. Besides I think this clutch will be fine for the power I plan to get out of it.Quote:
This clutch comes factory in the F10 550i, which puts down 443 tq and weighs a whopping 4552 lbs. DINAN doesn’t offer a clutch upgrade for their different stages of 550i’s, so apparently they feel that it is adequate. Their Stage 3 550i puts down 580 tq and they kept the factory clutch. Also, someone on the forums is using this clutch and claims that it is holding at over 620wtq on aftermarket turbos. To me, it sounds like the clutch is severely underrated.
My 135i won’t see more than 500 tq anytime soon. I’d guess that it is currently around 420whp/465wtq, but only weighs 3300 lbs!
Now here's my question. The guy in his thread switched to a single mass flywheel. It doesn't sound too bad, especially at idle and not under load. But when you turn the headlights on and the AC you can definitely notice it. Enough that I really don't want to live the single mass flywheel life since this car is a daily for now.
I know dual mass flywheels aren't really meant to be refinished, since its a pain in the ass and often isn't done right. You just go ahead and replace the flywheel with the clutch.
Question - Can I use another 135i stock flywheel and use the upgraded 550i clutch? The clutch (pressure plate specifically) is the holding power right? The mating surface of the dual mass flywheel or single mass flywheel wouldn't have any impact on overall grab or performance?
Please note that I will not be doing this job myself. This is not a DIY I ever want to do especially on a car that I need to get to work lol
No comment other than to reinforce that SMF chatter is significantly worse with the AC running and my foot off the clutch. Reminds me of my grandfather’s 1982 Mercedes 240 Diesel. Drives great, but the noise is embarrassing as shit.
Yea.... I think I'll be putting a dual mass flywheel and heavy duty Sachs clutch in mine. The smoothness of the M2's drive train has me wanting that back in my car
So then running the stock dual mass flywheel would be fine with an upgraded clutch? The pressure plate is the part that gives the grip and holding strength?Quote:
Originally Posted by Sockethead
You have a single mass flywheel on the ZHP?
Yes, That is correct... The pressure plate provides the clamping force. Your car has been fully modded since practically new, so you can see that the clamping force of the stock clutch is actually quite good. When I was living in NJ there was a indy in West Chester PA. that I took my car to, Bimmerwerks, he had a full track car. It was a 335 I believe. He had a stock clutch in it and said it worked great and had no desire to put anything else in it...
No I still have the dual mass but I'm pretty sure that the flywheel has failed as I am getting a lot of noise at idle. Peter (slater) had a short video clip in his touring build thread that showed a failed flywheel. I have around 145K hard miles on the car
Thanks Rob, good to know. Yeah and for the most part the stock clutch is still holding 405whp. It only started this recently with Kristen's psycho tune on it. The oem feel is something I want to retain, and that's why the upgraded oem clutch for the 550i is so appealing.Quote:
Originally Posted by Sockethead
Gave her a wash last night. I forgot how quickly the wheels get dirty. Rear wheels dust almost as bad as the fronts did on the ZHP. Parents keep telling me I should get ceramic pads to avoid the dust. That. Will. Never. Happen. I don't care about dust if it means I have the hands of God stopping the car
Going to Florida for the next 10 days so the car is now sparkly clean and will be sitting in my parents garage. Stepdad will drive it a time or two while I'm gone, and I'm excited to hear what he thinks since he's still never been in it or driven it.
I can only imagine the cold start sound inside of the garage!
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Rob, PFC Z-rated pads are excellent IMO and have very little brake dust. When the time is right, maybe look at them as an alternative to OE pads. Both cars look great!
I don’t know the answer to this, so maybe I’m being an idiot—is it possible to keep the DMF while switching to a non-SAC? I think that’s what really made the big difference for me in terms of feel. Maybe the 1er doesn’t use an SAC, idk.